Malicious PDF — malware analysis report

Static analysis result for SHA-256 759b07402e5383bd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 21:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05e03d8ff8ea53c153933e7e1044df46 SHA-1: 70a3131dae838c123551af38a9dd19a03c3c1488 SHA-256: 759b07402e5383bd3b33d3950e0b1921976ad19ea8cfa90b4f99c0dc22b149d5
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. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a0f43a344badf45c14440af019b754a4/doparado.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609630c5611e7---48393653181.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/33856256091.pdfIn PDF document text
    • https://krossi.ru/images/content/files/28424785086.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/vesadesukavibugizexapu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072394d6ab49---jorolo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/152636a6484aaa0f789eb4cfe2f31e29/45498358999.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e85a5a8c6---9843593640.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/roxezuke.pdfIn PDF document text
    • http://gibisch.biz/files/files/vakajamawapud.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4jv0d7d7cajd08t239v0d40vnn/22366418965.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/45adb3ccf0b471f243c29ae5d9f2a366/kubawisuligivemovi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1115d082---48717864520.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c614c2714c2---neperetotidemu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f8c34158300c8d94d1d5b7bab22805d5/zefizumezomelaxuxuwulo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1548084a---porogawadosemunivu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/22c5625709ae24c916b128c53918e836/zukalajodiwalofomo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610933dfcceb0---4266937136.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/panosuvopiribunu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/gixawexukelijapesozife.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108428bc7482---jitogarajatit.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fegufozip.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j637d89buset3s26gm7i98vvri/27014687763.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/datonidajalebax.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/53acffd86df0056ad17e0801f8c651b6/jegejelofitogiloga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=titration+curve+pogil+answersPDF 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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 10764 bytes
SHA-256: d7855a7d4cc98d6a4ca4fd417a15e63c6b601093caf3c8a83586a9d052a9e164
font_01_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 15892 bytes
SHA-256: 3a369cc9ba8620cf201dcb19473daec26a3d976dfa8ce56b6cb454bb22111976
font_02_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1