Malicious PDF — malware analysis report

Static analysis result for SHA-256 288c43a4b762ae9c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 18:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9de3343cce466ed748f7d9a2c70fceb SHA-1: 3268e748dd805ebf8920d4749308da8d518a1130 SHA-256: 288c43a4b762ae9c9c798d2dd489b5c81c9dc3c68e03e7385fb131080fe2c372
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=is+my+cousin%27s+cousin+related+to+me PDF link annotation
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/0f088305c6fd7fa07c10aa8a8aa5838a/janiwedisavijabipajirub.pdfIn PDF document text
    • https://langumeistras.lt/i/File/95578545790.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93cb6dd06f---guxugodofasajozujixuxib.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zewalabune.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4ba56fcb---xowuj.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wopekajejekodir.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160888c028b3b7---xijazavopizavenurubobanu.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062501164673499.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/40435041617.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/c8givv1npq1pe1m0c12smec722/fedufatijipule.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/45227909486.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/273b0cddbd29f3e427ebfd43ebc52762/80685880983.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/or5g6gtbsi141mm41vrhdto5hh/ravilafibonumadijawa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/semexuxonepenonebi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/64057272820.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/6061478554.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/boforunedugabirixaza.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/fotasoxekixalizurupolafo.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8662847b2---xoxevejewil.pdfIn PDF document text
    • http://adveotec.com/img/file/36621290265.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/sulubusenuvotena.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b237e4f67b6fe7e06db5134c339677e/nuwetixuwuwelorunet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 17196 bytes
SHA-256: 8e1767f83839e980657ba8dcd631d1973cb97745476badbb0063cd1065df18d1
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 10732 bytes
SHA-256: cc055f1e1062b831b7edf17581e747c66aeb264eca5a65b01329179e7cddf055

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