Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1969f0de526143…

MALICIOUS

PDF

100.5 KB Created: 2021-07-04 06:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 883d8401651f19402121ed28eac6b18a SHA-1: d53452d6d70e354696378d3f7dad9f4732345e5c SHA-256: 4f1969f0de526143b6f691462188b43a960cdf2e6762ed90499f15ac81b3aea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be directing users to malicious external URLs for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=unmet+need+meaning PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8fa7f9331940a699a8a406f243bcfcb6/1942875154.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0edad79a---batudugexuf.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1e3aa737f0f33f4d749d6ae4fe134cb6/90918285204.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67284706468.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b770dd8531---sasagiwarewuwisezufudob.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/15559169106.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2314a0a5d63bc2df97f7f40770e3c088/kesilosu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/76208501256.pdfIn PDF document text
    • http://mobilenmr.com/files/files/rukirazudibabaj.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab66c5cf7---42309672551.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a602d0e9e85---46893949921.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/ladavatix.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfeb0fd8f---1240227688.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rlqhjnfmqn8h7t4mkh6vo04djv/5350277315.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/eb7lt8sb9jps0b8tt38i214lsf/zobemafe.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6e1a6eb28ef8e2a4fe4a608629f2f84/12993754868.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfc05695b---10291085783.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33716e32da---nadefabebolareronususuw.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/99227799559.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afabc56407d---62223865539.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/05c5a9de7694a25a6a40fa0e666992af/nixemigedufididitiji.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fed12ea51---xepinuxobikiben.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fibiwovev.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mesorubelalol.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/fupofojuwelesupetuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010c15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C15 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 10164 bytes
SHA-256: 0fe140f830e6b2f4433a2ee9dd42effadebc2b36050de9a61d5004f146f3c5e7
font_03_sfnt_off0001402c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402C 22088 bytes
SHA-256: 91cd8237d8f081e3eba9e0f8c415a6f9dff1c613fdb7cc48022761265a782100
font_04_sfnt_off00017670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17670 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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