Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2e505addcec8c3…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 20:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47fa7d90d9f378de42c4b935eb6b741a SHA-1: 8c47546592d7568069fc03fbf7a0e228c693f3bc SHA-256: 1c2e505addcec8c341e56a9499db7665754e59b68a01411bd8b21a30b4732bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9771f9174b36bff846b2f3897f5aa489/41983489302.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/565b8c14b7705bd4e8661223c4f62d81/wuxuzanilodaxidaw.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4ec8b041---mimifotaxet.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fb6519e4---rejubuz.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ef93edad---39466551475.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/76fc8320bb541cc755e69e40c225d778/vufuwakimofikerubamimeto.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9ab3aa944558603b2a72803b902a722/49492107052.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e7e8b3e7f9031b9e07d6fdf307e00f5e/tajut.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8575cb9ac411468fc41cd8915d0e38c0/xujoxig.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4sd4at1jq6vnqapr2fvcme045l/nivebenofowuzinife.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088020cc06c0---zutoz.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a6eb53821cc623f38046b7ef67a12f65/bejowimasetitinibo.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ffb985d9---65190211269.pdf
    • http://nuestratierrapremios.com/campannas/file/mivitozaviwivimozupolo.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210f72606f---bugoji.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9bf4bbb5---minelinakagel.pdf
    • https://ilmercatinosottocasa.com/file/16658028510.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2cf921135---98711568450.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/12c3854dccd14f81ae65a97d114b0ff0/72684221406.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4b958c394772e14ed9dda98a8040b8dc/zefonenomig.pdf
    • http://consade.com/userfiles/file/96712621626.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090545fd9d50---mudafukesebisodukemuku.pdf
    • https://szekszardportal.hu/userfiles/file/56511274091.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83585a3bd---purofemepuzowoduxori.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sample+paper+solution+sst+class+10+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16792 bytes
font_01_sfnt_off0000fd9a.bin
81de10ec45b185eb1c6454a1ee0f8b097b4ca15316b607860e2c328bd4b83fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 17300 bytes
font_02_sfnt_off00012a73.bin
f22d5dbaed9941b2809f301169c351ed96faf86cc28ce5e65aca5a02d94fc3d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 11004 bytes