Malicious PDF — malware analysis report

Static analysis result for SHA-256 36185f975aa39ed7…

MALICIOUS

PDF

91.2 KB Created: 2021-08-03 23:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 726b35d65b0d5daab6cd8d2b3ee6345b SHA-1: eca936b8cbe3ce6a31cdb9898e3db5a9ed654c48 SHA-256: 36185f975aa39ed7163957e15859fd8305ff9ad862c5f17981b14c9d5494d42e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33846e4417---7379826910.pdf In PDF document text
    • http://upasamed.org/Content/uploads/files/gefofimed.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p2o5ic6ffapa5tem7fd38rjbdn/78600745863.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3ofebcgln5otk45hrqku2j1q98/70535002294.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/leregovunasalomozofu.pdfIn PDF document text
    • https://numberonerevolution.it/file/78169461141.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/83576531613.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jlati9g0q2cf75c30jsefqbmm9/vedugagonumuwanigubelup.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v732923mm0enooj56u9egti9kd/sikuweru.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/49840748346.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/vumifupikafosakuw.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ugkj6sk2rfsn9jil8eorb15lg6/gaberasanatotikisu.pdfIn PDF document text
    • http://4bx.pl/public/file/35680351494.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809cca3e46a---99989227718.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/36074459115.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jogete.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/62646194567.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c380842968---wupedikomanekiluw.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/51333161845.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcafa85b10a---domerugipelelafumom.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/72918005437.pdfIn PDF document text
    • https://bio86.net/fichiers/futimoga.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/tatepaxikovejixo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2c3e1cb---2631070962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+stop+my+tv+from+overheatingPDF 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_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11016 bytes
SHA-256: a9ccac9e92781ed17b35aae1def37789f31d9db0c81a6a3fd9f1c7c5c92e1a98
font_01_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16500 bytes
SHA-256: bb03cd83c6df3c2cbf11019c946768df0db5c69ad3e1e67d10e65e3211e9c4f1
font_02_sfnt_off000143dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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