Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7b037d62c8f277…

MALICIOUS

PDF

94.0 KB Created: 2021-07-26 21:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 52b85a27a7dd66c50fe8627cb17f5fda SHA-1: 504eae27d7de7ef673d430e77a0977fbefc7dca9 SHA-256: 6a7b037d62c8f2770131ab5cf03394cab0c2950bf08e659d8de080e8c6fe9a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress sites. The PDF contains numerous embedded URLs, many of which lead to suspicious locations, suggesting an attempt to redirect users to malicious content. The presence of multiple compromised CMS upload links indicates a pattern of hosting malicious files on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f67f75df4---82347361574.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/off6p2vlgmu6af157tt3078rir/87359853996.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggdvu5lkpeb870ihvs6svg5g73/nojogik.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1a3ad8cc---sasupubepowamejis.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c3cc4294---buxitosowepipa.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/33991319585.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/julotemegeradafaj.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0ed81617---geperubuzapagagefopi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gutigegasivuwirovurener.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4241b6e56---luvoxofupob.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/8337459869.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/palebejapubidepa.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/narajan.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/bolozitis.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mesgmar70s763ep3ioeship8t2/ruralewojanafewina.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/59173138734.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/32719366760.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/733def0909b6b272ad641bc579bb386f/33686325909.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4550153c5---vavagibopelonekexukazaz.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r1iqt5t35hsuo558irdi3ftei8/65902007207.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608519a9a7e46---36982375787.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b7e79d8a---xexazakuriril.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8180293---71342105806.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/39427041703.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/worakidev.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=le+futur+proche+le+futur+simplePDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 16336 bytes
SHA-256: 0ba07f6d54a4cb2ae74247f97c6a926e6d6308299df35fe3bea2e399aa3885da
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 20192 bytes
SHA-256: 980a7c618228cb14a9a4b95983fb2a546677dc5c4dce38c28c5b9d96f5f847d9
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 10536 bytes
SHA-256: 895be119f18733a1a12ddb4a6b4afa2072bbef108a3bbc9322baaa27979ad3be
font_03_sfnt_off00014fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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