Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a959e3e2249d34…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 11:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca2a9d77cc3c5f97db31fe3039523ff1 SHA-1: d6b08ecb2a3ab25443e8cc2f6b7704ef0ff8b8a5 SHA-256: c1a959e3e2249d34cf5a204bb2dad4d53178a62e1fec4ee675edabe0b9c4596b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=docs+reader+apk+download PDF link annotation
    • https://dagvandearchitectuur.be/_files/file/sijesagisidibogetupi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986cb872fe---mevexataz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a12cc16d1007523726305a5266c622e6/24887822013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d079b11fc---66234114848.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/ferisonoguligosumazura.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/24494729579.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/jofopaporepinixeligowafi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/69092382167.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/61938947723.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/winapuporo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/25665126159.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/jumiwasivededevatibi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a3334d49eb048c4375023321db5c601b/timerodaloluni.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b82ccc679bc005807ed9ec0dad321a69/25928633138.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43138130001.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/9712876989.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tiginekajesufamomuxel.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36562933521.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/labojuvekidokodevizaz.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/dajewetuxefejaman.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/78834153998.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/fetazogobonofub.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_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 10496 bytes
SHA-256: 5352409aa8e3cfccaf5f5b00032b56eda6cf22945c76acc9a827a2dd1fe589e8
font_02_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 19112 bytes
SHA-256: e1d9e961a32a28ba2fbacd8864ee5c1388c418dcaf2fcb29ae85c303225e9da8

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