Malicious PDF — malware analysis report

Static analysis result for SHA-256 43700140e9e98fd8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 16:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 989f654a41175cc5673f222c90a59576 SHA-1: ee8e6223e1864bddcbd1d3a3c3137753fa7e74bc SHA-256: 43700140e9e98fd89c55c03ab956138ea6eaf84f19a156d1374fd37ae865bd94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://assessmentinsight.com/ckfinder/userfiles/files/dirajajewebabudigegis.pdf In PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/wowewovaterum.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16147031f6db3c---lonidufulani.pdfIn PDF document text
    • https://ip-pharma.net/data/files/jenomozuzes.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6133a9597---70491546302.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/75428164631.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/kipako.pdfIn PDF document text
    • http://liyangah.com/Upload/file/moxewapotoduxuxomusut.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/50726495765.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/guvulademugifuleder.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416944e95ad---kebebemelom.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/81570475202.pdfIn PDF document text
    • http://maidichike.com/upload/files/64268772884.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/34509970296.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jigitujodadupedetonuwulir.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/16053345425.pdfIn PDF document text
    • http://rayer.cn/d/files/lejevelobuzajuwanasijamew.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/suvoz.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/wonemekaxegixizubazula.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/93130319602.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/62843588314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=grand+stickman+rope+heroPDF 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 15560 bytes
SHA-256: cd1551e1bdb782a5ee2386809f855ef03f6628973e7c2811f1014d760b7de862
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10864 bytes
SHA-256: f3fe19c7de5f17b1444a611b14d8903c58bcc48d0c9abee3cabddb3be442b1f5
font_02_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1