Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3bd3abf3ce0d65…

MALICIOUS

PDF

70.4 KB Created: 2021-06-19 04:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 81a132cafab0d5b46f85ea2360deffeb SHA-1: 4613024a20ab79b8ef2db591188de513644d3035 SHA-256: 2e3bd3abf3ce0d65a3b25723207cad745ae993d5bce51406a8d2089d245015ef
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm tactic for SEO poisoning. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=engineering+drawing+by+nd+bhatt+solutions+free+download+pdf PDF link annotation
    • http://uralinteh.com/uploads/files/kujefeviguxixobav.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f184af650---43331239814.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/witulawomawufaludiputefun.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g8gifkssvajhc6t9u6r55nptan/49797617100.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/cpubthup8pnbmfts79f8f0frqt/80971137223.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419d781e9f---fovixisim.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sisukezituza.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/99121998338.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/wugibozurazivu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829ebcad33---gasoralabugaxejuwesere.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d3f76afc822aaaec1652333fe046c522/31308944496.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/69459682377.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jhkjjv61lpf1ujd5f10snl4jn0/jufuvugogisejezonipidom.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d514dacb---5726759155.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f3d62c48b227130099f935021cc92514/8324967832.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ipinokefa.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/2684655627.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f27259a7---65641758112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73B 5476 bytes
SHA-256: 337b95ee69325712ccb0450c1e5ecc3744b21daeed40434bec13c3f5fe1ef709
font_01_sfnt_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 10520 bytes
SHA-256: d6bcf5edcf4aca94e1dbb54fe0134c5ebd2f49bd7fcdf2a6f8762485511cebb0
font_02_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3