Malicious PDF — malware analysis report

Static analysis result for SHA-256 a853e31b2111e7f0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 21:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b22366ba265aad5315bb671d11566bd9 SHA-1: 15b85c3c66533a2399da9bae04b5add56769afc1 SHA-256: a853e31b2111e7f0c1ce0cb178324031f0ffacd4c83c3e0a1fa685f3b73c2d5c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd51b3be46---tizok.pdf In PDF document text
    • https://paklya.su/design/img/upload/file/18467729606.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56bcf60517520dae949fa34084717f18/39635936822.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/69026185870.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30a2a8a6c8a22c1cc09a9e5df4157996/57958499132.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/63995d279027291276ffceac5136314b/42318339188.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zusuxajafufuvovi.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nevudipupunivipuxe.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/8922987865.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098c34f0ffd4---runujagujejavuga.pdfIn PDF document text
    • https://vestol.bg/files/file/daweri.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/feeab7e69e0c757613ecf4305ac0f9ce/nejenu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/2b4024dfa1fb44e8e9a5d3e86f355d66/49227564845.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/jorelaronubozetefoxagenom.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd2c55e88---bumumilisesakatogem.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d22f47a31---pasaretowurozagosuzezuti.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae313c91389---jibojibegesamedubixune.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/04b03eb89d55fa18ed36b9266dc34ac4/39803008452.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/2494887645.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/58859666036.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9180ad9b1---81227094870.pdfIn PDF document text
    • http://fields-on-earth.com/fudivawal.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/71616982880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=division+2+world+tier+6PDF 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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10520 bytes
SHA-256: ff420d3adfb0a16d1ef002027f89e2d50d414bdd5fe2dc44cda593cb30a253c2
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 17744 bytes
SHA-256: 2ace6cef5b826d5e4eac9e4589d36b6968cc9971c7e5f13832228c18e8986727
font_02_sfnt_off000135e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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