Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1977b48799fa07b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 17:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4384b9656036058f73be6ffe923e1f65 SHA-1: a4b93ea1abf84626bb898d93b110f92acb1fade1 SHA-256: f1977b48799fa07b519de503d047c680af1493e2b8aaa9f65e2df399aa806308
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://biancoacolori.it/userfiles/files/sexodebovuvilaxu.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7774f70f8ff789939745e9c5707df4b2/koxunadozajovimibetubabu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/33804489211.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141321547aa0---8769748184.pdfIn PDF document text
    • https://asiapharma.la/files/files/fetikigevakuzujeb.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/31827151824.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091609300218.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/luzanenabupejetezesasukev.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/20657996401.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909192057_2104084981.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/famogafejod.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/80545446694.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/jakufodujofuzudero.pdfIn PDF document text
    • https://felicityokolo.com/file/gotidafogimaxobevomatup.pdfIn PDF document text
    • https://anup.bo/images/files/rizuronikupomeri.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/53411816193.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/94635146932.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/96742140961.pdfIn PDF document text
    • https://cecprint.com/images/file/55610796114.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/popivesarumuxuwixa.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-14-13-35-20-UQw0pH9C.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/30376046138.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tosetu.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/rodegifejozepokavagivibug.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/afuvoa3ldg9v75svqojshbsem1/xegebevasew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sims+mobile+unlimited+money+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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 15616 bytes
SHA-256: 9e6480bd21123c6f1f5c097a3aa06341fb80f7b855881be0e0fc338c5e6f399a
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10976 bytes
SHA-256: 55d8ee522ab4de1551ea00ce2dad28eff178b8a975501dd0a773a565db6763d7
font_02_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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