Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2b780c390627c8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae744c0fc3d3f8b9ded355b1776570e4 SHA-1: 9e3b9c95697c03df35050c325427ab2bc2881ac0 SHA-256: dd2b780c390627c862db34aa2d117b302afa42155ca714ac600d127c26eb1c1f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on potentially disposable domains or IP addresses. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hl3khsun6gpjg21558884m3ffc/likozimixawosaxez.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/wekef.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614070b8e3594---napiwusuxefogolalawudef.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/pokum.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/zisegeviwadejutovokoz.pdfIn PDF document text
    • http://lulanjina.net/upload/files/58919518599.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/keratonukiz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/vuzepafilesidarujilukuxan.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/wufarujamexo.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fozekomixizogamusem.pdfPDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e8d6e18ba346ea55474cd4a91ceeec95/sifodesupaviguzal.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/23605848720.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/muzerodimejisije.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/46161236968.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mejimatifakukafulidumesu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/396528620d3ce0ae609383356dc6dcc6/75973548349.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/5123253392.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kumoj.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/dokoguxumirevi.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210910151529.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/25270219565.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/sobovugufejatevaro.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/dobenoketowa.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/jamuwusebepifegasokubuz.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/dezewetorurujebosit.pdfIn PDF document text
    • http://cityfate.com/files/files/7332069205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=age+of+sigmar+gaming+book+pdfPDF 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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 10908 bytes
SHA-256: 74fe23dc2a5afb82425abffaf04ebd9ce92a572b94160a57a13dd3336f991af5
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 17956 bytes
SHA-256: 63259d50930607f88cd71235a3eb7e65112b565c794e493a5e7d9447c29023c0
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1