Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27cec1ab9832fae…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 01:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0286502e337325ae5ac45bdaaeb09c51 SHA-1: 3823378e8d6de375956957898c0c7a67e5d55f13 SHA-256: a27cec1ab9832faecc16d44392b73e021e5f66451989edaef1028a124fb755cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b9d1929ed63e90bc8bf5fdd99985b8cf/19205110880.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160867564c49df---xitenuvazisadujeso.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/xivigalakojotiz.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74528696890.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa68f1583b---28140819281.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/bijurig.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/degevojabajem.pdfIn PDF document text
    • https://cafesca.com/ckfinder/userfiles/files/49137612534.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607356f2cf03e---23679690232.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/zasogoxademiseku.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dolina.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4477d7c25eb27b01f360126dbf839549/jafofiwalasa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/feverutamo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ad7dc227a2d459cfe937cf7ae1ec5d45/80647948534.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/58408100297.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/12873756218.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nazojujobepabokivanataxig.pdfIn PDF document text
    • http://askaudit.ru/price/33832362171.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceff22c43---54120418377.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/13429573393.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/034c65439230d04b3e7561a75940a4a6/ruxonugobe.pdfIn PDF document text
    • http://ihdbd.org/upload/files/teliwar.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/16355707254.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/89478902499.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/76461949837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+bhavishya+purana+in+english+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 19672 bytes
SHA-256: 25e635478fb9ca624660ebcb26aefd1d194c5875ab3a8762f57daa5d51c76d3d
font_01_sfnt_off000135a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A4 11184 bytes
SHA-256: bbb75706d13ab2ca9520aee66b770187741a9d48c6a2fc38620de30931632295
font_02_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1