Malicious PDF — malware analysis report

Static analysis result for SHA-256 febb87ab4b6164b1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 11:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88943be94af627fa137c0419fa4fdef3 SHA-1: e40afb61a917d1408b0db806a830e39759fcf00b SHA-256: febb87ab4b6164b1688759e78dabac8a367579a2f2be6bee6e912a2bac64261a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and multiple external links, indicating it is designed to redirect users to malicious websites. The presence of a callback lure suggests a social engineering attempt to solicit a phone call, likely for further exploitation. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=escaping+the+nxivm+cult+a+mother%27s+fight+to+save+her+daughter+full+movie PDF link annotation
    • http://hulstcustoms.ru/uploads/files/pujub.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b8e0d7384cb919f392c53822a880f468/89905141315.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/93031776206.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/89520860041.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210926135219.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/81691061259.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jizawifojegagaze.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v8op18j3pjvpkjcrh00s9cv91p/88676722366.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/ralodexuxexiv.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xuwudexulolivisagip.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/87618893146.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/vinosusoporovagikin.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/63863787622.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/pixusemaziko.pdfIn PDF document text
    • http://runo34.ru/attachments/file/libav.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/danesufosotojonora.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210919040038.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb76d2759---zedebajilotes.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/84166412898.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff46de6d---10219745993.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///kodaxudazomadopigumeko.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zaluse.pdfIn PDF document text
    • http://handgun.ee/media/file/dagewarefemolej.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/93281571371.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613512fbe617a---wodizalizafodagapij.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/xejatikogezaturujavutex.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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 14068 bytes
SHA-256: 642131aff10e2d067b3061e0af7087969b1ec289049f00acd91d708801fbd91f
font_01_sfnt_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 11352 bytes
SHA-256: d5d643784382af3ff5c538a3449f895b7954c92dc5fe5fdf2342e003376bbe58

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