Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfb39e7675f7408…

MALICIOUS

PDF

130.7 KB Created: 2021-06-27 04:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f375121bb08b85650bb5a3f5f648645 SHA-1: 791e81fa80446e44f0c62f7c0fedc929a0fbe207 SHA-256: ddfb39e7675f740871f145cbc2c86913b286b015ea6434cb33a85f1165c6345c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9b16e7fcab68fd5c259d767fcfa05382/26829548209.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f33fd0a422b16f9adc8b8a74ce65c416/73608430207.pdf
    • https://mvpartners.be/images/uploadedimages/file/julafejamekokizi.pdf
    • https://synodradomski.pl/userfiles/file/55510558841.pdf
    • https://rybczewice.pl/userfiles/file/xaxobadijifezu.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4svpkq2vki1qe278jclfs78ds/nefiwotonefisovagudob.pdf
    • http://mobilesamara.com/img/files/file/99810604336.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/rabigorepo.pdf
    • https://cordovajewelry.com/images/file/xepajoradefetesabelu.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9cd1353e---44302067893.pdf
    • http://tamker.hu/userfiles/file/kobupumajasumepimigujig.pdf
    • http://bhs-class1957.com/clients/35434/File/wototugoloveweviwovev.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083410210210---71370815914.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/39987647919.pdf
    • https://loctra.net/userfiles/file/niriwas.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d575258aeac21b3bc0d543afc51a6c63/zetiduguzifitofezu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32851ab0---mibaza.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab8bcc94d---kavukamivudavatupab.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ed4st42ftcqslp6648igvs936i/42256580369.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33aa32bcac61b2f709e45b238b2e12ea/sununujuxefexa.pdf
    • http://rszm88.com/upfolder/e/files/20210618145605.pdf
    • https://agrilaui.com/userfiles/file/xirowamupile.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099312bbc554---68378644325.pdf
    • https://sport-jicin.cz/dokumenty/2750646729.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+human+form
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ee6.bin
c05fca3e9f49c1c532dbc5419545288a7bf12c50ce4175575eebab20f3d4ccb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE6 19860 bytes
font_01_sfnt_off0001a28f.bin
fb8a624e9cbb9485ccdb575277366be438f999a6d5978ee23d895491a3e4b8fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28F 10984 bytes
font_02_sfnt_off0001bba6.bin
1550d4180c81eb20d31e9974f041f4792ba8d085be879590057d67632c0a6b78
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBA6 12644 bytes
font_03_sfnt_off0001e2d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2D5 16792 bytes