Malicious PDF — malware analysis report

Static analysis result for SHA-256 3861c7f8ebcddecc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 22:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d153d070606682e335ab1c063222fccf SHA-1: be571db22919fbacd93914156fbd1943c614bdf2 SHA-256: 3861c7f8ebcddeccdf17211d4ca89672bd150f855bd35e0bafa8e759fb49a2ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=prepositions+worksheets+kindergarten PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/tam8jpd1l4c0s3ome5mulkhju5/50985264586.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608903d6c75e2---fojovup.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f444d2c28c5---89195518562.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/lazepemodawaj.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8f6cd43---83748779311.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eac1ea6abdbc2bb36eb139fe2ffc28db/69868622350.pdfIn PDF document text
    • https://paperland.bg/uploads/file/perigopebufomix.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bd57a1e2a83d6a174f684a97451a132f/15426591138.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36999768441.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/70ef4274cb338d8b56e81df4dd820c35/26470416238.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/fejixivuxawatixivexid.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11770416052.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/20520449432.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/41866212085.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/46qc8f0idloiqome4tmnojfto4/lenuvuxuxabarasovi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/697a4577eb07a6e64ea3d042c2d7d1be/55706131464.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210623_2F55138AA3CCB1B1.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/14996231309.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/nozezasepupab.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wotowas.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/43508132787.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe921a6cc8---tosare.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5a2c98f5---43512394251.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_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 16752 bytes
SHA-256: 7c522dc63bc925fea3f988d08e90f4ccc70a67a7b2f27aef6a94ed9410e06641
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10804 bytes
SHA-256: e9b790a119e1f5b92fc5be173a41d059b22e3b54680491af768264412b9f00c4

Open this report in the interactive analyzer, or submit your own file for analysis.