Malicious PDF — malware analysis report

Static analysis result for SHA-256 855df8febfda519c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 029e42a878dba9a51a1333e1946343c1 SHA-1: 5554780ef6d3fd25a9c7357144200d790cbba28a SHA-256: 855df8febfda519c8db483e9443ac379959050f865905d7899b285bdd24e3694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites. These URLs are likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=conversion+chart+cm+to+m PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/547f00de02a6e6b610834c22edc6a774/18259266744.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/98c5d915195e217d6af912f8d208e5e3/kidofesakebofufej.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zilolaxowomujos.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/lavasenanumofizedipevi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a218ec9b---60838723471.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6e963f181231e177b77024d14809ac49/lagesofizujemawemuwijati.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/taletukeji.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/16323155234.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/31af82dc51bc23a202cb6813a675ba0e/jinuvu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1ced715c---43748271747.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/24733982015.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ae3edc7d4fb38a1d7374187b8169b3c1/48414654783.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/8556374843.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d4d70dc6---wezepaxuwufasazodip.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sku65llk6n7asjmtt9l3hc07j8/tipipixe.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/xapulevem.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b16b0282e148e21303e5729912ef353d/zitexopet.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c47114eb345---23731392915.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/875ab911f428a41335772e1dc04220cc/zobesugizerad.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/g12k945gjqln0bv7gdrkos4m5v/gomujajivizuzosudu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b04c20cd16---38667984651.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e1eb6ee89005a398908fd497a831e347/93230616964.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ea2b40c23f67cd975e908559381829e4/44104241734.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8925fef26cc84ff807494b671bbf39f7/gafotumedu.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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 10544 bytes
SHA-256: 7cf6e1f16ad56325476ff31d678dba075be3d7d7605b65cd1438e2197e356fe3
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 17464 bytes
SHA-256: 09b2ae554c3c4c78da942cb406463c29507fef80e7caf22bc591d996f78c48f5
font_02_sfnt_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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