Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b1e82061984207…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56b31c6983bc000dbe60120dd7f26b73 SHA-1: 3fef78f6e87199a708f472ef61cc20b77acfa6ce SHA-256: a0b1e82061984207c829ea597d47affab59c6409db7caa69c8bcbfc089586f0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe7ba05---20892953322.pdf In PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/retevasateru.pdfIn PDF document text
    • http://mlead.net/images/e/file/furaropuzodidotid.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a7822aac6c87b32cd9cc811cfda98147/69571228910.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109021911161161.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5bnrru0b57umqisdbn59h15mfq/miraginuxabutemidiwefaxo.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/wurexam.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/36044276141.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/kamepu.pdfIn PDF document text
    • https://t2sc.me/userfiles/ligebiriluguzuzo.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/jexapaz.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/30218296978.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sedezidadiropegukare.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rolajalonomeguwu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/74786891965.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jorifilosukipafukiji.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/11314568686.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49505093589.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/fujek.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/fesoron.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kaforexuj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130737250a19---71219207256.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///dubonutox.pdfIn PDF document text
    • http://sireny.net/share/files/meganixeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+ticwatch+facesPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10224 bytes
SHA-256: 7b58af41d0a85c92bd6afebefa1aee087c991256caaa179cdef160a470055a07
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 16940 bytes
SHA-256: 3e0ca82217462b7ca354be34c454a0a7ee4d59b9c2bfeb6da9c2bfeb826647ee

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