Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe89087a646e9635…

MALICIOUS

PDF

78.5 KB Created: 2021-10-10 16:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a408741c5fe0f8d66cc7ffedbdef5984 SHA-1: 49d28e232fa589a73ecd0a9eb34bcede8ca96da4 SHA-256: fe89087a646e96358d1a395bb17b2dc26038fdfcf9aa4a309471a7b4283f31dd
296 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_TRAVEL_SUPPORT_PHONE_SCAM' heuristic indicates a high volume of repeated phone numbers, suggesting a scam or phishing attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file. The document body, while truncated, contains text related to 'operations manual' and links, reinforcing the lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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://naturalfurnish.com/userfiles/file/35754740797.pdf In PDF document text
    • https://idd.no/ckfinder/userfiles/files/2131252416.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/zereba.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/dilojotetejijaja.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/36610693825.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/bobized.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/8751336094.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/sotoxupakula.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/45339504458.pdfIn PDF document text
    • https://pcetravel.com/files/file/95724612915.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c78839d24c9e32ae2993434328792a0e/juxebuboxozadexufa.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/21273701265.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/10450688073.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/41844529823.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/wasifuluvakevutodexezil.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/davekup.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zuxofowenukajalo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3518290ad---bejenuxo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614256ac7d289---34960097744.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/5626682483.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210910102811.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/44936479534.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/sajut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sample+of+operations+manualPDF 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 extracted file (font_00_sfnt_off0000cb9c.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000cb9c.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 10696 bytes
SHA-256: 6c03a77851cd520189450701ddb5bdfdbaf2c840d0abafe03f27579e7a433727
font_01_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 18476 bytes
SHA-256: 9ec850bf86bef2b41859ac47334c5879173e3729684aa981c5a1baa668abdb9a