Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91a3aa415d79ce8…

MALICIOUS

PDF

77.0 KB Created: 2021-06-29 08:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ce0c3c0535e5797e97a0c0ed3d707dc SHA-1: d1b272ad3d4f7559720705b57ee6d1007eff85dd SHA-256: f91a3aa415d79ce81d1dc5ab950b7b93dc82ae51f612be82f24f4164b7d601eb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress installations or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, as indicated by the 'PDF_JS' heuristic and the ML classifier's high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=there+as+in+place
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fceec78349---ditebogemo.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/168d7228c1e14906f522a3fa31298888/lokun.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a300f9dc9e9---wamokeruw.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b73090a87d1e87728294cccb46173a69/tifomekozuwatejafalodij.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/17e451d7bccac1e7ec0a2638ba523aad/55463762459.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712cc497558---42583559223.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf6ee7fe4---94941742442.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/45799653957.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/94650516665.pdf
    • http://tokyoto.pl/UserFiles/file/53344828009.pdf
    • http://nensi.si/upload/file/14183146822.pdf
    • http://ahkjt.com/upfile/file/fonazerigereja.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a66880da---17536772858.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/80931777172.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872fc9986dc---vuzadetuxelijemidof.pdf
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/pemizijaripeg.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5189eeb7c880caa376e1be15db92a27d/19165193640.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e707fa3973---somani.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/79239c66abf35f3b4d9202e4f1d1eeca/54268523078.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838ae8de718---20660255684.pdf
    • http://abc-tel.ru/data/File/niriseranivijovekajuxokuw.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51fcdca15---direxevadubo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2eabf94b---movewugigogidava.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb3a4fb9d---42112550017.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609621c5d3fa9---lumufopisute.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c840.bin
3fd749a40caa21da29275efb02f8129aa76f36bdc9e549ea3c882de6bc2de6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10216 bytes
font_01_sfnt_off0000df0c.bin
cc0d05367729c04e1f200b9a7b980d8111d2e20de8e7485b256c0783062d5f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 17600 bytes
font_02_sfnt_off00010d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 16792 bytes