Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d3a063cad20700…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00a4db49fe3722f539db36e5d716b905 SHA-1: e75d5c761178a6bb0b0d9bb88a0864342b84ad9d SHA-256: 19d3a063cad20700d09d7fd925c98b026b2256c15bfcec6d6c40749a9e7618cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://summitremodelinginc.com/userfiles/files/silikexogapujox.pdf In PDF document text
    • https://bloomland.com/sites/bloomland.com/files/vixokipomipogoposizoxixad.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360580ab06e---38747295737.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/timodipivasom.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/8828008002.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/topozatiwebituvolowinidu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xerokiratubafutanet.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138398d544---73432828497.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zewenoperejubepogujoji.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/xopesujokibozegosipoka.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/zosuzukara.pdfIn PDF document text
    • https://comfort8889.com/upload/files/47056604807.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902095438.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/jifirizozu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d98d975f3---jureru.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/63445991794.pdfIn PDF document text
    • https://inarsindbari.org/uploads/bepikanufuzato.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/79422291637.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/93469875322.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/1132843172.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210908105750.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/86322780937.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b8503605---pavejozedawevuwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=final+fantasy+xv+pocket+edition+mod+apkPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17732 bytes
SHA-256: 10ff9a29a8923cf6b9c59b453ee87d912b66c2a246bb364d51b06bc615bbb4c8
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 11032 bytes
SHA-256: 9d1f7134b72af905ef5441dfdd59c69b0021441eebe9b842e63c1a4dc49dfc82

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