Malicious PDF — malware analysis report

Static analysis result for SHA-256 802cb59d7d511335…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 02:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b0646e2ee62f0df178bb2b0ee17ae2d SHA-1: ef0fffaf668773ad9d05a1061c57b33865b47980 SHA-256: 802cb59d7d511335a349e5753172e000c563f4e137d13ae075303c8b69d4fc1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=apa+style+example+paper PDF link annotation
    • http://barcabianca.eu/upload/file/13901201863.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sererajelus.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gojifiboxixubet.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/55480555368.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/80488537472.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a1171c5ac---vakixuzuwikopojojilito.pdfIn PDF document text
    • http://effektfilm.de/files/file/6349724880.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2e147fd73---29903826281.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/60028137619.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43138f64c---lasusugomugo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q9a7f58aneebsqjibirk9j2930/64483062665.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9adb8675fe---39196540711.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1495ee8a9a8ea7a3d705279802e7db3a/denova.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb3e4931---92306447543.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/68892281238.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1c204742---18070321394.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/122f1dcce4483b738cf26f11e3caa3fb/49855115425.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f311c7088920aeccfbd144563fd3a482/rinoko.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/rotomujizejin.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610890ec751d5---kokoko.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf72bd8382---zeturosanoxufesipuzakikaw.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021726617504527.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/gojovevigi.pdfIn PDF document text
    • https://led7.ru/file/43837588780.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10292 bytes
SHA-256: ddc7ee0cbc665286caf88f5847f78535fda00b3d43dd644afdb5be66e095c120
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 18984 bytes
SHA-256: 15c2bb48d177e6900bca20816a9019f931790a442a562f847d51578ece2a6d8a

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