Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76d8124da2b8e4a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 11:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07b4f247a1834fd92438d52ce7421beb SHA-1: e1445886c99b5ff16e855622ed0ef89bbdf63757 SHA-256: a76d8124da2b8e4ae546bff210f25f35a39b116b86a261d5677a7c44d3102030
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming operations, as supported by the 'Callback phishing phone lure' heuristic. The presence of JavaScript points to T1059.007, and the overall nature of malicious documents delivered via email suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=from+inquiry+to+academic+writing+4th+edition+pdf PDF link annotation
    • http://adgroup.co/userfiles/file/14500565678.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/18228181272.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ae45eeda---mosibefenexujiduvekojo.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_102457_199.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/84620770061.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134437853ffa---memofadaresilabajorav.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/dewegovosuvijetozej.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16138472266e89---50190967307.pdfPDF link annotation
    • https://toscanafantastica.com/userfiles/file/83987131164.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/nixotipumogevajufekisekot.pdfIn PDF document text
    • http://slsnn.ru/content/files/winute.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/rugapikixiwomig.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7dd44beb9b49fc7d349bea0fd1448966/15911040940.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/58704449159.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/99158457204.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/luzeduvusenewe.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/23824560997.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/nigezifaxove.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/20645365653.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/93357096159.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/25277440805.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdfIn PDF document text
    • http://ternovykh.ru/content/file/94854220506.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jeraduf.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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 11356 bytes
SHA-256: 4b2203bb2dc630dcce54bd8bba13b687d215d8a7a64c16fad959fa91f89812eb
font_01_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 18232 bytes
SHA-256: 0ec42cecba5d3ae314121fc86f52ccaa551b5f10996bb3655dcdf50b4ae14d32
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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