Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb3c5b71cb5a19c…

MALICIOUS

PDF

126.1 KB Created: 2021-08-11 17:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5e145300e19cf74b2b98864277ebb463 SHA-1: 29fc0b7911db23eeadbddf9386493698396d9add SHA-256: abb3c5b71cb5a19c8faa23cd003fbc74ce10006c2c39e235c6b8e1e81c229408
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. 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 heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ks25g32ofq4uhlekn4ek3nump6/vobiderasa.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab125619640---8947564959.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8e9b7adde01d1fb33cbde65065b5f3af/ruwoxovigodejagusog.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070410628e83---95910088108.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rdej17vkg4k9eh1r8mjerhpt3v/zarobulixonodojeja.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/32940207404.pdfIn PDF document text
    • http://hasyo.net/files/file/wixarowuzufoxu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161060fe79a261---35555884529.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/sukujix.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/juwedopubunematevopuzaf.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kixagale.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f365e54d3c---bibevezifaxa.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zaviriwiresad.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ci14ion07v48ba20fu2hpdmhae/womiseramijibalimorixoxi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sozakosajozeno.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/28300020822.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/rujalifozu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/fanopusewubefaw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7f66d304---54173332945.pdfPDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b8c390ac713---956969976.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216685625609.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210802/file/1627902317.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/53507297201.pdfIn PDF document text
    • http://metallpress.info/files/83776695659.pdfIn PDF document text
    • http://tfforming.ru/d/files/43499562411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+clean+mode+on+mr+coffeePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17054 17780 bytes
SHA-256: 72a4059ef0d7ffdc4c3ecfce75b0472aad8da77619d98f34388658797f4286a9
font_01_sfnt_off00019f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B731 10720 bytes
SHA-256: 27bb59ceeed2682bcb83d0f9075afd9e6de0d48dc01ad2c4e556c72bf568e011
font_03_sfnt_off0001cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDB 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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